(19)
(11)EP 0 473 205 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
17.06.1992 Bulletin 1992/25

(43)Date of publication A2:
04.03.1992 Bulletin 1992/10

(21)Application number: 91118743.3

(22)Date of filing:  30.06.1987
(51)International Patent Classification (IPC)5A61F 2/06, A61L 27/00
(84)Designated Contracting States:
DE FR GB

(30)Priority: 08.08.1986 JP 185165/86

(62)Application number of the earlier application in accordance with Art. 76 EPC:
87109404.1 / 0255865

(71)Applicant: UBE INDUSTRIES, LTD.
Ube-shi, Yamaguchi-ken 755 (JP)

(72)Inventors:
  • Joh, Yasushi, c/o Yokohama Branch, Chiba Res. Lab.
    Kohoku-ku, Yokohama-shi, Kanagawa-ken (JP)
  • Kaneko, Noriaki, c/o Yokohama Branch, Chiba Res.
    Kohoku-ku, Yokohama-shi, Kanagawa-ken (JP)

(74)Representative: Hansen, Bernd, Dr. Dipl.-Chem. et al
Hoffmann, Eitle & Partner Patent- und Rechtsanwälte, Postfach 81 04 20
81904 München
81904 München (DE)


(56)References cited: : 
  
     
    Remarks:
    This application was filed on 04 - 11 - 1991 as a divisional application to the application mentioned under INID code 60.
     


    (54)Process for producing a medical tube


    (57) Disclosed is a process for producing a medical tube, comprising thrusting forward a core rod having a round cross-section and made of a rigid body from a circular orifice to extrude a solution of a high molecular weight compound from a gap slit defined between the orifice and the core rod in such a manner that the solution is spread over the whole surface of the core rod.
    The core rod is then passed through a dry section of 5 to 300 mm at an extrusion rate of 1 to 300 mm/sec. The core rod is then led to a solidifying medium to solidify the high molecular weight compound, after which the core rod is removed.
    The medical tubes produced by the present process have excellent compatibility with blood, and are particularly suitable for use as artificial blood vessels which are required to have excellent long term patency.





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